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我試圖在我的NodeMCU v3上使用RF522,使用SPI接口。我能夠將RF522連接到我的Pi Zero,並且可以掃描隨附的芯片以及手機的NFC,因此我相信硬件是好的。與RF522一起使用NodeMCU V3時出現奇怪的行爲
這裏是我發現迄今(連接在下面的代碼文件):
- 如果我勾了一切,我不能上傳我的Arduino的草圖 (espcomm_upload_mem失敗),我無法運行腳本即在 NodeMCU上。
- 如果我斷開RF522的3v電源,我可以上傳腳本並運行它。
- 如果我離開了3V電源斷開,程序無法自檢:mfrc522.PCD_PerformSelfTest()
- 如果我插上3V電源線在NodeMCU啓動後,但自測試之前,它通過自檢和跑!
- 我從來沒有找到一張卡(永遠重複「無新卡...」)。嘗試了現有的芯片和手機,但沒有發現。
我不知道爲什麼安裝的電源讓所有的東西都不能啓動,我不知道爲什麼我的自檢通過時無法讀取卡!其他人有沒有經驗讓RF522和NodeMCU一起工作?
代碼:
#include <ESP8266WiFi.h> //ESP8266 Core WiFi Library (you most likely already have this in your sketch)
#include <DNSServer.h> //Local DNS Server used for redirecting all requests to the configuration portal
#include <ESP8266WebServer.h> //Local WebServer used to serve the configuration portal
#include <WiFiManager.h> //https://github.com/tzapu/WiFiManager WiFi Configuration Magic
#include <PubSubClient.h>
#include <SPI.h>
#include <MFRC522.h>
/*
*RST GPIO15 -- D8
*SDA(SS) GPIO2 -- D4
*MOSI GPIO13 -- D7
*MISO GPIO12 -- D6
*SCK GPIO14 -- D5
*GND GND
*3,3V 3,3V
*/
#define SS_PIN 2 // D4 -- SDA-PIN for RC522
#define RST_PIN 15 // D8 -- RST-PIN for RC522
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
WiFiClient espClient;
PubSubClient mqtt(espClient);
const char* MQTT_user = "rfid.local";
const char* MQTT_server = "mqtt.local";
const char* topic_base = "home/rfid/";
void setup() {
Serial.begin(115200);
Serial.println("Lets get started!!");
WiFiManager wifiManager;
wifiManager.setTimeout(180);
if(!wifiManager.autoConnect("RFID", "RFID")) {
Serial.println("Failed to connect and hit timeout");
delay(3000);
ESP.reset();
delay(5000);
}
Serial.println("Connected...yippie!");
mqtt.setServer(MQTT_server, 1883);
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
if (mfrc522.PCD_PerformSelfTest())
Serial.println("RF522 Passed self test!");
else {
Serial.println("RF522 Failed self test!");
delay(3000);
ESP.reset();
delay(5000);
}
Serial.println("Waiting for someone to scan...");
}
void reconnectMQTT() {
// Loop until we're reconnected
while (!mqtt.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (mqtt.connect(MQTT_user, MQTT_user, MQTT_user)) {
Serial.println("connected");
} else {
Serial.print("failed, rc=");
Serial.print(mqtt.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void loop() {
// Make sure we are still connected!
if (!mqtt.connected()) {
reconnectMQTT();
}
mqtt.loop();
// Look for new cards
if (! mfrc522.PICC_IsNewCardPresent()) {
Serial.println("No new card...");
delay(1000);
return;
}
// Select one of the cards
if (! mfrc522.PICC_ReadCardSerial()) {
Serial.println("Can't read card...");
delay(1000);
return;
}
// Dump debug info about the card. PICC_HaltA() is automatically called.
mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
//mqtt.publish(topic_base...);
}
刪除RST線還允許器件啓動並通過自檢,並打開Vcc。在這裏看到最後的評論:https://forum.mysensors.org/topic/4299/nodemcu-and-nrf-spi-init-problem/4 – Jaron
這是我用來使其與PI(只帶司機的工作1.44 ):http://bsd.ee/~hadara/blog/?p=1017我無法使普通的python實現工作。讓我懷疑我是否有一個不好的讀者? – Jaron